Go on. Explore!

lvl 0 • 0 xp

lvl 1

Home Market Decks Interests

Physics

memorize.ai (lvl 286)

(0)

36 cards

()

Section 1

Preview this deck

Does the time delay between the absorption and reemission of light affect the average speed of light in a material? Explain

Front

1 / 36

Physics

0.0

0 reviews

5			0
4			0
3			0
2			0
1			0

Active users

All-time users

Favorites

Last updated

6 years ago

Date created

Mar 1, 2020

Cards (36)

Section 1

(36 cards)

Does the time delay between the absorption and reemission of light affect the average speed of light in a material? Explain

Front

Yes Smaller delays lead to higher average speed.

Back

Imagine that a person can walk only at a certain pace—no faster no slower. If you time her uninterrupted walk across a room of known length, you can calculate her walking speed. If, however, she stops momentarily along the way to greet others in the room, the extra time spent in her brief interactions gives an average speed across the room that is less than her walking speed. How is this like light passing through glass? How is it different?

Front

There is a pause with each interaction, but light is absorbed and "new" light is emitted each time.

Back

How long does it take for light to travel across the diameter of Earth's orbit around the sun?

Front

960 s

Back

What is the source of electromagnetic waves?

Front

accelerating electrical charges

Back

Which theory of light is the photon more consistent with—the wave theory or the particle theory?

Front

particle theory

Back

Why do Polaroid sunglasses reduce glare, whereas unpolarized sunglasses simply cut down on the total amount of light reaching our eyes?

Front

Polaroid glasses filter the glare of reflected light from horizontal surfaces. Ordinary sunglasses reduce overall transmission.

Back

How long does light take to travel from the sun to Earth?

Front

8 min

Back

How does the role of inertia relate to the rate at which electric charges can be forced into vibration?

Front

Low inertia permits rapid vibration.

Back

How do polarizing filters allow each eye to see separate images in the projection of three-dimensional slides or movies?

Front

The Polaroid pairs in the projector and the glasses are at right angles.

Back

When light encounters a material, it can build up vibrations in the electrons of certain atoms that may be intense enough to last over a long period of time. Will the energy of these vibrations tend to be absorbed and turned into heat, or absorbed and reemitted as light?

Front

absorbed and turned into heat

Back

An ideal polarizing filter transmits 50% of the incident nonpolarized light. Why is this so?

Front

50% of the components of light are parallel to the polarization axis.

Back

Which type of eclipse is dangerous to your eyes if viewed directly?

Front

solar

Back

Is light simply a small segment of the electromagnetic spectrum? Defend your answer.

Front

Yes; the spectrum is also made up of radio waves, IR, UV, X-rays, and gamma rays.

Back

Light incident upon a pane of glass slows down in passing through the glass. Does it emerge at a slower speed or at its initial speed? Explain.

Front

initial speed, no absorption-emission delays outside

Back

If you fire a ball through a pile of sand, it will slow down in the sand and emerge at less than its initial speed. But when light shines on a pane of glass, even though it slows down inside, its speed upon emerging is the same as its initial speed. Explain.

Front

The speed of the ball decreases as it interacts with the sand. The photons that enter the glass are not the same photons that exit the glass.

Back

Why is light from a common lamp or from a candle flame nonpolarized?

Front

Electrons vibrate randomly, so light alignment is random.

Back

What happens to the energy of light when it encounters an opaque material?

Front

Absorbed, heating the object, or remitted as a reflection.

Back

How did a spinning octagonal mirror help Michelson calculate the time that light took to make the round-trip to the distant mountain?

Front

He knew the spin rate of the rotating mirror.

Back

What is a photon?

Front

particle of light

Back

Distinguish between an umbra and a penumbra.

Front

umbra = total shadow; penumbra = partial shadow

Back

How do the frequencies of infrared and ultraviolet light compare?

Front

increase from IR to UV

Back

Distinguish between a solar eclipse and a lunar eclipse.

Front

solar -- moon shadow on Earth lunar -- Earth shadow on the moon

Back

Suppose that sunlight is incident upon both a pair of reading glasses and a pair of sunglasses. Which pair would you expect to be warmer, and why?

Front

Sunglasses b/c they will absorb more sunlight

Back

From the star Alpha Centauri to Earth?

Front

4 yr

Back

Why does a high-flying plane cast little or no shadow on the ground, while, a low-flying plane casts a sharp shadow?

Front

A low-flying plane casts an umbra and penumbra, while at higher levels the umbra is filled in by the penumbra.

Back

In what direction is the polarization of the glare that reflects from a horizontal surface?

Front

horizontal

Back

Will glass be transparent to light with frequencies that match its own natural frequencies?

Front

No, energy is absorbed and converted to heat.

Back

How long does light take to travel a distance of two light-years?

Front

2 years

Back

What percentage of light would be transmitted by two ideal polarizing filters, one atop the other, with their axes aligned? With their axes crossed at right angles?

Front

50%, 0%

Back

Different bells and tuning forks have their own natural vibrations and emit their own tones when struck. How is this analogous to atoms, molecules, and light?

Front

Vibrating electrons in atoms and molecules emit light.

Back

Why are metals shiny in appearance?

Front

Metals have free electrons that vibrate, stop, and reemit light.

Back

You can get a sunburn on a sunny day and on an overcast day. But you cannot get a sunburn if you are behind glass. Explain.

Front

UV does not pass through glass.

Back

Why would you expect the speed of light to be slightly less in the atmosphere than in a vacuum?

Front

There are interaction delays in the atmosphere.

Back

What is the difference between light that is polarized and light that is not?

Front

polarized—vibrations occur in one plane nonpolarized—vibrations occur in all planes

Back

Short wavelengths of visible light interact more frequently with the atoms in glass than do longer wavelengths. Does this interaction time tend to speed up or slow down the average speed of short-wavelength light in glass?

Front

blue light

Back

What evidence can you cite to support the idea that light can travel through a vacuum?

Front

Sunlight and starlight are seen from Earth.

Back